Process for the production of 5,6-dihydroxyindolines

Details Process for the production of 5,6-dihydroxyindolines Process for the production of 5,6-dihydroxyindolines

1994-03-18

1995-03-21

Lee, Mary C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548491, C07D20908

Patent

active

053997131

ABSTRACT:
Process for the production of 5,6-dihydroxyindolines by ether cleavage of corresponding ether procursors with aqueous hydrogen bromide and subsequent direct crystallization from the aqueous reaction mixture.

REFERENCES:
CA116:158564K Hair Dyeing . . . Derivatives, Lagrange et al., p. 431, 1992.
Helv. Chim. Acta, 69(7), von Indu Parikh et al., pp. 1588-1596, 1986, (CAS Printout).
Helv. Chem. Acta 1968 (51) 1476-1494, von H. Wyler et al.
Journal of the Chemical Society (C) 1967, Letchworth GB pp. 1424-1427 S. N. Mishra et al. `Studies related to the Chemistry of melanins. Part III. Synthesis of 5,6-dihydroxyindoline.` *p. 1425*.

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